Gas meter



Tye. GAS

Dec. 19, 1922.

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To aZZavhor/ait may concern;

. Be it known thatlt, Tirnononri citizen of the United States, residing at boron valves are operated by the crank of a crank shaft driven by a crank arm thereoncalled a tangent arm. In order that the meter shall operate properly it is necessary that the tangent arm shall bear a correct angular relation to the valve-operating crank, and sometimes itis necessary, particularly in making repairs, to adjust the tangent arm rotatively onthe crank shaft. Heretofore the tangent arm has been fixed on the upper end of the crank shaft by means of a drop of solder, and in order to make adjustment "it has been necessary to melt the solder, and

then there was'no way of assuring accuracy in making the adjustment.

My present invention includes means, such as worm gearing, for rotativelyadjusting the tangent arm on the crank shaft.

I shall now describe the embodiment of my invention shown in the accompanying drawings and shall then point out my in-' vention in claims.

Figure 1 is a perspectiveview of the top of a meter embodying my improvement with the top cover and other parts removed.

Figure 2 is an enlarged perspective view of the crank shaft and its adjuncts, embodying my improvement.

Figure 3 is a further enlarged vertical section centrally of the upper end of the crank shaft on a plane indicated by the line 33 of Figure 2 as viewed from theright.

In gas meters of the type referred to,gascontrolling valves 1 slide. on valve seats 2 and are guided by wires 3 carrying wrist pins 4 connected by valve-operating arms 5, with a crank 6 on thelower end of a vertical crank shaft 7 on the upper end. of

which is fixed a tangent arm 8 carrying post 9 adjustably held in place by a pair of "jam nuts 10. Thetangent arm post 9 forms G. MoLNAn,

I a crankfl pinand connectedflthereto'a Mans pair of short flag arms or "links 11' which are connected to long "flag arms 12011 the upper ends of flag rods 13. 7 The oscillating 'orro'ckingmovement of thefiag rods 13 rotates the crank shaft 7 and operates the slide valvesl in a well known'manner. The index, indicated generally by the reference numeral 14, is operated by a horizontal axle 15 carrying a gear wheel 16 which is en-' gaged by a spiral or worm lT carried bythe, i

crank shaft 7.

According to my invention, the tangent arm 8 is adjustably fixed on the crank shaft 7 through the intermediary of manually operable worm gearing.

The tangent arm 8- is rotatively mounted upon the upper end of the crank shaft 7 and is fixed upona worm wheel 18, which is free to rotate on the crank shaft 7. A bracket 19 removably fixed upon the crank shaft 7 justbelow the worm wheel 18 has journaled thereon a worm 20 engaging with the worm wheel 18, and the screwthreads of the worm 2O closely fit between the teeth of the worm wheel 18 so as to prevent any lost motion or back lash. The projecting end of the worm 20 carries a knob 21 adapted to be manually rotated and the periphery of which has graduating marks thereon as shown with which a pointer 22secured, on

the bracket 19 co-operates to indicatethe The bracket amount of adjustment made. 19, and worm wheel 18, carryingwithit the tangent arm 8, are removably retained on the upper endof the crank shaft 7 by a washer andtap screw 24;

It is evident that merely by turning the knob 21 the valve-operating crank 6 may be adjusted'to any desired angle relatively to the tangent arm 8 by which the crank shaft 7 is rotated. i

It is obviousthat various modifications may be made in the construction shown in the drawings and above particularly described within the principles and scope of my invention.

I I claim: I 1 4 1. In a gas meter having a valve-operating crank shaft rotated by a tangent arm, a

bracket removably mounted on the end of the crank shaft, a gear wheel rotatably mounted on the end of the crank shaft above the bracket and secured to the tangent arm, a worm gear. mounted on thedbracketand adapted to engage the gear wheel and an indicating member, co-axially mounted With the Worm gear and adapted to rotate tangent arm, bracket and gear Wheel in pcthe Worm gear. v I sition, a Worm gear mounted on the bracket 2. In a gas meter having a valveroperatand adapted to engage the gear Wheel and ing crank shaft rotated bya tangent arm, an indicating member co-axially mounted 5 a bracket removably mounted on the end With the worm gear and adapted to rotate 15 of the crank shaft, agear Wheel rotat'ably the Wormgear.

mounted on the end of the crankshaft above In testimony whereof, I have signed my the bracket and secured to the tangent arm, name to this specification, this 19th day of v removable retaining means mounted on the June, 1920. a

10 upper end of the crank shaft for holding the 3 THEODORE G. MOLNAR. 

